Spectroscopic and electrochemical investigation with coordination stabilities: mononuclear manganese(II) complexes derived from different constituents macrocyclic ligands

Since the manganese(II) complexes are known as having a high degree of stability, some of them may be able to play a very important role in biosystems. We prepared manganese(II) complexes with different chromospheres containing macrocyclic ligands bearing N, S and O like functional donor atoms in order to obtain different models of compounds. So these new manganese(II) complexes were derived from macrocyclic ligands by chelating them with metal ions. Thus, two macrocyclic ligands, L(1): 2,4-diphenyl-1,5-diaza-8,12-dioxo-6,7:13,14-dibenzocyclo tetradeca-1,4-dieneN(2)O(2)]ane; L(2): 2,4,9,11-tetraphenyl-6,13-dimethyl-1,5,8,12-traazacyclotertr-adeca-1,4,8,11-tetraeneN(4)]ane; and two more different form first one viz.-L(3): 1,7-diaza-4-monothia-10,14-dioxo-8,9:15,16-cyclohexadecaneN(2)O(2)S]ane and L(4): 4,13-diaoxa-1,7,10,16-hexazacyclooctadecaneN(4)O(2)]ane were prepared and their capacity to retain the manganese(II) ion in solid as well as aqueous solution was determined from various physiochemical techniques viz: characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, mass, IR, electronic, ESR spectral studies and cyclic voltammetric measurements.